GoogleThe Chromium team has posted early alpha builds of the ported browser for OS X and Linux,…
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Teo en Ming, the ChromiumOS64 project lead, says of the download:

"The original Chromium OS project does not support 64-bit platforms. This is because the majority of the netbooks in the market are based on Intel Atom processors, which are mostly 32-bit."

With Chrome OS launching properly at the tail-end of 2010, we've got a full year to wait before we see anything more solid become available. And even then, it'll only be available on Google-branded devices, with Acer hoping to launch the first official netbook running it.